Charging device

Abstract

A charging device may include a Power Factor Correction (PFC) circuit including first to third inductors connected to each of first to third input terminals, and first to third switch legs connected to each of the first to third inductors; and a relay network including a plurality of relays. When the first input terminal, the second input terminal and the third input terminal are connected to each phase of three-phase powers, the relay network connects each phase of the three-phase powers to the corresponding one among the first switch leg, the second switch leg, and the third switch leg, and the PFC circuit is operated as a three-phase boost PFC, when a single-phase power is connected to one among the first input terminal, the second input terminal and the third input terminal, the relay network connects the single-phase power to the first and second switch leg, connects the third switch leg to the neutral point, and the PFC circuit is operated as an interleaved single-phase full-bridge PFC of single inductor type.

What is claimed is: 
     
       1. A charging device comprising:
 a Power Factor Correction (PFC) circuit including a first inductor, a second inductor and a third inductor connected to each of a first input terminal, a second input terminal and a third input terminal, and a first switch leg, a second switch leg and a third switch leg connected to each of the first inductor, the second inductor and the third inductor; and 
 a relay network including a plurality of relays, 
 wherein when the first input terminal, the second input terminal and the third input terminal are connected to each phase of three-phase powers, the relay network connects each phase of the three-phase powers to the corresponding one among the first switch leg, the second switch leg, and the third switch leg, and the PFC circuit is operated as a three-phase boost PFC, and 
 when a single-phase power is connected to one among the first input terminal, the second input terminal and the third input terminal, the relay network connects the single-phase power to the first switch leg and the second switch leg, connects the third switch leg to a neutral point, and the PFC circuit is operated as an interleaved single-phase full-bridge PFC of a single inductor type. 
 
     
     
       2. The charging device of  claim 1 , wherein the relay network includes:
 a first relay including one terminal connected to the first input terminal and the first inductor and the other terminal connected to the second input terminal and the second inductor; 
 a second relay connected between the second input terminal and the second inductor; 
 a third relay connected between the third input terminal and the third inductor; 
 a fourth relay connected between the neutral point and the third inductor; and 
 a fifth relay connected to the third inductor in parallel. 
 
     
     
       3. The charging device of  claim 2 , wherein
 when the first input terminal, the second input terminal and the third input terminal are connected to each phase of the three-phase power, 
 the first relay, the fourth relay, and the fifth relay are turned off, and the second relay and the third relay are turned on. 
 
     
     
       4. The charging device of  claim 2 , wherein
 when a single-phase power is connected to the first input terminal, 
 the first relay, the fourth relay, and the fifth relay are turned on, and the second relay and the third relay are turned off. 
 
     
     
       5. The charging device of  claim 4 , wherein
 the relay network further includes a sixth relay connected in parallel to a resistor connected between the first input terminal and the first inductor, and 
 the charging device turns on the sixth relay after a peak of a voltage input to the PFC circuit. 
 
     
     
       6. The charging device of  claim 2 , further including:
 a power conversion circuit connected between the PFC circuit and a battery and transmitting power from the battery to the PFC circuit. 
 
     
     
       7. The charging device of  claim 6 ,
 wherein the first switch leg includes a first switch connected between the first inductor and a first input terminal of the power conversion circuit and a second switch connected between the first inductor and a second input terminal of the power conversion circuit, 
 wherein the second switch leg includes a third switch connected between the second inductor and the first input terminal of the power conversion circuit and a fourth switch connected between the second inductor and the second input terminal of the power conversion circuit, and 
 wherein the third switch leg includes a fifth switch connected between the third inductor and the first input terminal of the power conversion circuit and a sixth switch connected between the third inductor and the second input terminal of the power conversion circuit. 
 
     
     
       8. The charging device of  claim 7 , wherein
 when a single-phase power is connected to the first input terminal, 
 the first relay, the fourth relay, and the fifth relay are turned on, and the second relay and the third relay are turned off, 
 during a period in which the single-phase power is a positive voltage, a period in which the first switch, the third switch, and the sixth switch are in an ON state and a period in which the second switch, the fourth switch, and the sixth switch are in the ON state are repeated, and 
 during a period in which the single-phase power is a negative voltage, a period in which the second switch, the fourth switch, and the fifth switch are in the ON state and a period in which the first switch, the third switch, and the fifth switch are in the ON state are repeated. 
 
     
     
       9. The charging device of  claim 2 , wherein
 the relay network further includes a sixth relay connected in parallel to a resistor connected between the first input terminal and the first inductor, and 
 the charging device turns on the sixth relay after a peak of a voltage input to the PFC circuit. 
 
     
     
       10. The charging device of  claim 1 , further including:
 a relay control circuit connected to the first input terminal, the second input terminal and the third input terminal to detect an input terminal to which a power is connected among the first input terminal, the second input terminal and the third input terminal and controlling the relay network. 
 
     
     
       11. A charging device comprising:
 a Power Factor Correction (PFC) circuit including a first inductor, a second inductor and a third inductor connected to a first input terminal, a second input terminal and a third input terminal, respectively, and a first switch leg, a second switch leg and a third switch leg connected to the first inductor, the second inductor and the third inductor, respectively; and 
 a relay network including a plurality of relays, and 
 when the first input terminal, the second input terminal and the third input terminal are connected to each of three-phase loads, the relay network connects each phase of the three-phase powers to a corresponding one among the first switch leg, the second switch leg, and the third switch leg, and the PFC circuit is operated as a three-phase inverter, and 
 when a single-phase load is connected to one among the first input terminal, the second input terminal and the third input terminal, the relay network connects the single-phase load to the first switch leg and the second switch legs, connects the third switch leg to a neutral point, and the PFC circuit is operated as a single-phase inverter. 
 
     
     
       12. The charging device of  claim 11 , wherein the relay network includes:
 a first relay including one terminal connected to the first input terminal and the first inductor and the other terminal connected to the second input terminal and the second inductor; 
 a second relay connected between the second input terminal and the second inductor; 
 a third relay connected between the third input terminal and the third inductor; 
 a fourth relay connected between the neutral point and the third inductor; and 
 a fifth relay connected in parallel connected to the third inductor. 
 
     
     
       13. The charging device of  claim 12 , wherein
 when the first input terminal, the second input terminal and the third input terminal are connected to each phase of the three-phase load, 
 the first relay, the fourth relay, and the fifth relay are turned off, and the second relay and the third relay are turned on. 
 
     
     
       14. The charging device of  claim 12 , wherein
 when the single-phase load is connected to the first input terminal, 
 the first relay, the fourth relay, and the fifth relay are turned on, and the second relay and the third relay are turned off. 
 
     
     
       15. The charging device of  claim 12 , further including:
 a relay control circuit connected to the first input terminal, the second input terminal and the third input terminal to detect an input terminal to which a load is connected among the first input terminal, the second input terminal and the third input terminal, and controlling the relay network. 
 
     
     
       16. The charging device of  claim 12 , further including:
 a power conversion circuit connected between the PFC circuit and a battery and transmitting power from the battery to the PFC circuit. 
 
     
     
       17. The charging device of  claim 16 , wherein
 the first switch leg includes a first switch connected between the first inductor and a first input terminal of the power conversion circuit and a second switch connected between the first inductor and a second input terminal of the power conversion circuit, 
 the second switch leg includes a third switch connected between the second inductor and the first input terminal of the power conversion circuit and a fourth switch connected between the second inductor and the second input terminal of the power conversion circuit, and 
 the third switch leg includes a fifth switch connected between the third inductor and the first input terminal of the power conversion circuit and a sixth switch connected between the third inductor and the second input terminal of the power conversion circuit. 
 
     
     
       18. The charging device of  claim 17 , wherein
 when the single-phase load is connected to the first input terminal, 
 the first relay, the fourth relay, and the fifth relay are turned on, and the second relay and the third relay are turned off, 
 the first switch and the second switch are alternately switched, the third switch and the fourth switch are alternately switched, an ON period of the first switch overlaps an entire ON period of the fourth switch, and an ON period of the third switch overlaps an entire ON period of the second switch, 
 the fifth switch is in an OFF state, and the sixth switch is in an ON state.